diff -r 13ca3810a105 -r cc9b6e64027c hgext3rd/topic/revset.py
--- a/hgext3rd/topic/revset.py	Thu Sep 12 15:22:50 2019 +0700
+++ b/hgext3rd/topic/revset.py	Thu Sep 12 15:38:11 2019 +0700
@@ -132,7 +132,7 @@
 
         def getrange(st, a, b):
             start = 1 if a is None else a
-            end = len(st.revs) if b is None else b + 1
+            end = len(st.indexedrevs) if b is None else b + 1
             return range(start, end)
 
         revs = []
@@ -143,7 +143,7 @@
             else:
                 st = stack.stack(repo, branch=repo[r].branch())
             for n in getrange(st, a, b):
-                if abs(n) >= len(st.revs):
+                if abs(n) >= len(st.indexedrevs):
                     # also means stack base is not accessible with n < 0, which
                     # is by design
                     continue
@@ -151,7 +151,7 @@
                     # quirk: we don't want stack base unless specifically asked
                     # for it (at least one of the indices is 0)
                     continue
-                rev = st.revs[n]
+                rev = st.indexedrevs[n]
                 if rev == -1 and n == 0:
                     continue
                 if rev not in revs: